iP or domain name lookup

ns15.helpshift.com Server iP：

Current resolution：

domain resolution record：

2020-01-31-----2020-02-22 52.9.197.178

2020-02-22-----2020-02-22 54.183.111.10

2020-02-22-----2020-02-22 52.53.42.130

2020-02-22-----2020-02-22 52.52.54.108

2020-01-31-----2020-01-31 52.9.16.178

2020-01-31-----2020-01-31 54.215.202.18

2020-01-31-----2020-01-31 52.52.235.78